\(3\sqrt{2x}-\sqrt{18x}+\dfrac{1}{2}\sqrt{32x}\)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(3x\sqrt{2x}-3\sqrt{2x}+2\sqrt{2x}\)
\(2\sqrt{2x}\)
\(=3\sqrt{2x}-3\sqrt{2x}+\dfrac{1}{2}\cdot4\sqrt{2x}\)
\(=2\sqrt{2x}\)
\(M=\dfrac{3}{2}\cdot4\sqrt{2x}-\dfrac{1}{3}\cdot3\sqrt{2x}+\dfrac{2}{5}\cdot5\sqrt{2x}-4\sqrt{2x}=6\sqrt{2x}-\sqrt{2x}+2\sqrt{2x}-4\sqrt{2x}=3\sqrt{2x}\)
\(M=6\sqrt{2x}-\sqrt{2x}+2\sqrt{2x}-4\sqrt{2x}=3\sqrt{2x}\)
\(ĐK:x\ge\dfrac{3}{2}\\ PT\Leftrightarrow3\sqrt{2x-3}-2\sqrt{2x-3}+6\sqrt{2x-3}=1\\ \Leftrightarrow7\sqrt{2x-3}=1\\ \Leftrightarrow\sqrt{2x-3}=\dfrac{1}{7}\\ \Leftrightarrow2x-3=\dfrac{1}{49}\Leftrightarrow x=\dfrac{74}{49}\left(tm\right)\)
\(ĐK:x\ge0\)
\(\Leftrightarrow3\sqrt{2x}-6\sqrt{2x}+4\sqrt{2x}=2\)
\(\Leftrightarrow\sqrt{2x}=2\Leftrightarrow2x=4\Leftrightarrow x=2\left(tm\right)\)
a. ĐKXĐ: $x\geq 1$
PT $\Leftrightarrow \frac{1}{2}\sqrt{x-1}-\frac{3}{2}.\sqrt{9}.\sqrt{x-1}+24.\sqrt{\frac{1}{64}}.\sqrt{x-1}=-17$
$\Leftrightarrow \frac{1}{2}\sqrt{x-1}-\frac{9}{2}\sqrt{x-1}+3\sqrt{x-1}=-17$
$\Leftrightarrow -\sqrt{x-1}=-17$
$\Leftrightarrow \sqrt{x-1}=17$
$\Leftrightarrow x-1=289$
$\Leftrightarrow x=290$
b. ĐKXĐ: $x\geq \frac{1}{2}$
PT $\Leftrightarrow \sqrt{9}.\sqrt{2x-1}-0,5\sqrt{2x-1}+\frac{1}{2}.\sqrt{25}.\sqrt{2x-1}+\sqrt{49}.\sqrt{2x-1}=24$
$\Leftrightarrow 3\sqrt{2x-1}-0,5\sqrt{2x-1}+2,5\sqrt{2x-1}+7\sqrt{2x-1}=24$
$\Leftrightarrow 12\sqrt{2x-1}=24$
$\Leftrihgtarrow \sqrt{2x-1}=2$
$\Leftrightarrow x=2,5$ (tm)
c. ĐKXĐ: $x\geq 2$
PT $\Leftrightarrow \sqrt{36}.\sqrt{x-2}-15\sqrt{\frac{1}{25}}\sqrt{x-2}=4(5+\sqrt{x-2})$
$\Leftrightarrow 6\sqrt{x-2}-3\sqrt{x-2}=20+4\sqrt{x-2}$
$\Leftrightarrow \sqrt{x-2}=-20< 0$ (vô lý)
Vậy pt vô nghiệm
\(C=3\sqrt{2x}-5\cdot2\sqrt{2x}+7\cdot3\sqrt{2x}+1\\ =3\sqrt{2x}-10\sqrt{2x}+21\sqrt{2x}+1\\ =14\sqrt{2x}+1\)
\(B=\dfrac{3}{\sqrt[3]{2}+1}\Leftrightarrow B^3=\dfrac{27}{2+1}=\dfrac{27}{3}=9\\ \Leftrightarrow B=\sqrt[3]{9}\)
\(3\sqrt{2x}-\sqrt{18x}+\dfrac{1}{2}\sqrt{32x}\)
\(=3\sqrt{2x}-3\sqrt{2x}+\dfrac{1}{2}\cdot4\sqrt{2x}\)
\(=2\sqrt{2x}\)